package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.constant.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.RedisKeyUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author 花木凋零成兰
 * @date 2024/3/7 20:25
 */
@Controller
@Slf4j(topic = "LoginController.class")
public class LoginController {

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Autowired
    private RedisTemplate redisTemplate;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    /**
     * 返回注册页面
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    /**
     * 用户注册
     * @param model
     * @param user
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功，我们已经向您发送了一封激活邮件，请尽快激活!");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    /**
     * 激活用户 // http://localhost:8080/community/activation/userId/code
     * @param model
     * @param userId
     * @param code
     * @return
     */
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);  // 激活
        if (result == CommunityConstant.ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功，您的账号已经可以正常使用了!");
            model.addAttribute("target", "/login");
        } else if (result == CommunityConstant.ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作，该账号已经激活过了!");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败，您提供的激活码不正确!");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

    /**
     * 获取登录页面
     * @return
     */
    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response/*, HttpSession session*/) {
        // 生成验证码
        String code = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(code);

        // 将验证码存入session
//        session.setAttribute("kaptcha", code);

        // 验证码存入到Redis
        // 验证码的归属
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);   // 设置有效时间 60秒
        cookie.setPath(contextPath);
        response.addCookie(cookie);

        // 将验证码存入Redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, code, 50, TimeUnit.SECONDS);  // 设置验证码在Redis中有效时间为60秒

        // 将图片输出给浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            log.error("响应验证码失败：" + e.getMessage());
        }

    }

    /**
     * 用户登录
     * @param username
     * @param password
     * @param code
     * @param rememberMe
     * @param model
     * @param session
     * @param response
     * @return
     */
    @PostMapping("/login")
    public String login(
            String username, String password, String code, boolean rememberMe,
            Model model, /*HttpSession session, */HttpServletResponse response,
            @CookieValue("kaptchaOwner") String kaptchaOwner) {

        // 获取session中存储的验证码
        // String kaptcha = (String) session.getAttribute("kaptcha");

        String kaptcha = null;
        if (StringUtils.isNotBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }


        // 获取Redis中的验证码

        // 检查验证码
        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确!");
            return "/site/login";
        }

        // 获取凭证 有效时间
        int expiredSeconds = rememberMe ? CommunityConstant.REMEMBER_EXPIRED_SECONDS : CommunityConstant.DEFAULT_EXPIRED_SECONDS;
        // 检查账号 密码
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) {
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);    // 声明Cookie有效路径
            cookie.setMaxAge(expiredSeconds);   // 声明Cookie有效时间
            response.addCookie(cookie);
            return "redirect:/index";   // 重定向到首页
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    @GetMapping("/logout")
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        SecurityContextHolder.clearContext();
        return "redirect:/index";
    }


}
